Realistic Lighting- Improved skyboxes and weather

Description about Realistic Lighting- Improved skyboxes and weather

- Sky has now realistic color and gradient (night/dawn/midday/sunset)- HDR and Bloom tweaked to more realistic values- a lot more different cloud variants at all times - Realistic full moon - 3 different types of bad weather 1) Thick clouds but no rain and no thunders 2) Same as above plus medium rain and without thunders 3) Storm with heavy rain and thunders